This study aims at analyzing the effect of the competence of school supervisors and school principals on work motivation and performance of Junior High School teachers in Maros Regency. This research was a quantitative research by using survey approach. This approach was used because it is adjusted to the nature and assumptions of the study in accordance with the research problem. This study used a fairly large population because it involved all teachers of Junior High School in Maros regency totaling 734 teachers. The results show that the competence of school principals is predicted through five indicators. The first is the dimension of learning and achievement. The second is instructional leadership. The third is the management of the learning environment. The fourth is the responsibility of learning and assessment. The fifth is a social personality. The dimension of instructional leadership contributes greatly to the competence of principals and supervisors. In general, the competence of school principals, the competence of school supervisor, teachers’ work motivation, and teachers’ performance are in the middle category. However, special attention is required to improve the social personality as well as research and development of the school supervisors. The research found that the competence of the school principals positively affects the teachers' work motivation. The principal’ competence positively affects the teacher performance. The competence of the school supervisors positively affects the teachers' work motivation. In addition, the competence of the school supervisors positively affects the teachers’ performance in Junior High Schools in Maros.

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